Buggy code:
public class TernaryOperatorNode extends ValueNode { String operator ; String methodName ; int operatorType ; ValueNode receiver ; ValueNode leftOperand ; ValueNode rightOperand ; String resultInterfaceType ; String receiverInterfaceType ; String leftInterfaceType ; String rightInterfaceType ; int trimType ; public static final int TRIM = 0 ; public static final int LOCATE = 1 ; public static final int SUBSTRING = 2 ; public static final int LIKE = 3 ; public static final int TIMESTAMPADD = 4 ; public static final int TIMESTAMPDIFF = 5 ; static final String [ ] TernaryOperators = new String [ ] { "trim" , "LOCATE" , "substring" , "like" , "TIMESTAMPADD" , "TIMESTAMPDIFF" } ; static final String [ ] TernaryMethodNames = new String [ ] { "ansiTrim" , "locate" , "substring" , "like" , "timestampAdd" , "timestampDiff" } ; static final String [ ] TernaryResultType = new String [ ] { ClassName . StringDataValue , ClassName . NumberDataValue , ClassName . ConcatableDataValue , ClassName . BooleanDataValue , ClassName . DateTimeDataValue , ClassName . NumberDataValue } ; static final String [ ] [ ] TernaryArgType = new String [ ] [ ] { new String [ ] { ClassName . StringDataValue , ClassName . StringDataValue , "java.lang.Integer" } , new String [ ] { ClassName . StringDataValue , ClassName . StringDataValue , ClassName . NumberDataValue } , new String [ ] { ClassName . ConcatableDataValue , ClassName . NumberDataValue , ClassName . NumberDataValue } , new String [ ] { ClassName . DataValueDescriptor , ClassName . DataValueDescriptor , ClassName . DataValueDescriptor } , new String [ ] { ClassName . DateTimeDataValue , "java.lang.Integer" , ClassName . NumberDataValue } , new String [ ] { ClassName . DateTimeDataValue , "java.lang.Integer" , ClassName . DateTimeDataValue } } ; public void init ( Object receiver , Object leftOperand , Object rightOperand , Object operatorType , Object trimType ) { } public String toString ( ) { } public void printSubNodes ( int depth ) { } public ValueNode bindExpression ( FromList fromList , SubqueryList subqueryList , Vector aggregateVector ) throws StandardException { } public ValueNode preprocess ( int numTables , FromList outerFromList , SubqueryList outerSubqueryList , PredicateList outerPredicateList ) throws StandardException { } public void generateExpression ( ExpressionClassBuilder acb , MethodBuilder mb ) throws StandardException { int nargs = 0 ; String receiverType = null ; LocalField field = acb . newFieldDeclaration ( Modifier . PRIVATE , resultInterfaceType ) ; receiver . generateExpression ( acb , mb ) ; if ( ( operatorType ) == ( TernaryOperatorNode . TRIM ) ) { mb . push ( trimType ) ; leftOperand . generateExpression ( acb , mb ) ; <START_BUG> mb . upCast ( leftInterfaceType ) ; <END_BUG> mb . getField ( field ) ; nargs = 3 ; receiverType = receiverInterfaceType ; } else if ( ( operatorType ) == ( TernaryOperatorNode . LOCATE ) ) { leftOperand . generateExpression ( acb , mb ) ; mb . upCast ( leftInterfaceType ) ; rightOperand . generateExpression ( acb , mb ) ; mb . upCast ( rightInterfaceType ) ; mb . getField ( field ) ; nargs = 3 ; } else if ( ( operatorType ) == ( TernaryOperatorNode . SUBSTRING ) ) { leftOperand . generateExpression ( acb , mb ) ; mb . upCast ( leftInterfaceType ) ; if ( ( rightOperand ) != null ) { rightOperand . generateExpression ( acb , mb ) ; mb . upCast ( rightInterfaceType ) ; } else { mb . pushNull ( rightInterfaceType ) ; } mb . getField ( field ) ; mb . push ( receiver . getTypeServices ( ) . getMaximumWidth ( ) ) ; nargs = 4 ; receiverType = receiverInterfaceType ; } else if ( ( ( operatorType ) == ( TernaryOperatorNode . TIMESTAMPADD ) ) || ( ( operatorType ) == ( TernaryOperatorNode . TIMESTAMPDIFF ) ) ) { Object intervalType = leftOperand . getConstantValueAsObject ( ) ; if ( SanityManager . DEBUG ) SanityManager . ASSERT ( ( ( intervalType != null ) && ( intervalType instanceof Integer ) ) , ( "Invalid<seq2seq4repair_space>interval<seq2seq4repair_space>type<seq2seq4repair_space>used<seq2seq4repair_space>for<seq2seq4repair_space>" + ( operator ) ) ) ; mb . push ( ( ( Integer ) ( intervalType ) ) . intValue ( ) ) ; rightOperand . generateExpression ( acb , mb ) ; mb . upCast ( TernaryOperatorNode . TernaryArgType [ operatorType ] [ 2 ] ) ; acb . getCurrentDateExpression ( mb ) ; mb . getField ( field ) ; nargs = 4 ; receiverType = receiverInterfaceType ; } mb . callMethod ( INVOKEINTERFACE , receiverType , methodName , resultInterfaceType , nargs ) ; mb . putField ( field ) ; } public void setLeftOperand ( ValueNode newLeftOperand ) { } public ValueNode getLeftOperand ( ) { } public void setRightOperand ( ValueNode newRightOperand ) { } public ValueNode getRightOperand ( ) { } public boolean categorize ( JBitSet referencedTabs , boolean simplePredsOnly ) throws StandardException { } public ValueNode remapColumnReferencesToExpressions ( ) throws StandardException { } public boolean isConstantExpression ( ) { } public boolean constantExpression ( PredicateList whereClause ) { } public Visitable accept ( Visitor v ) throws StandardException { } private ValueNode trimBind ( ) throws StandardException { } private void setResultType ( TypeId resultType ) throws StandardException { } public ValueNode locateBind ( ) throws StandardException { } protected ValueNode castArgToString ( ValueNode vn ) throws StandardException { } public ValueNode substrBind ( ) throws StandardException { } private ValueNode timestampAddBind ( ) throws StandardException { } private ValueNode timestampDiffBind ( ) throws StandardException { } private void bindDateTimeArg ( ValueNode arg , int argNumber ) throws StandardException { } private boolean bindParameter ( ValueNode arg , int jdbcType ) throws StandardException { } public ValueNode getReceiver ( ) { } private void throwBadType ( String funcName , String type ) throws StandardException { } protected void bindToBuiltIn ( ) throws StandardException { } private DataTypeDescriptor getVarcharDescriptor ( ) { }

Fix:
mb . cast ( leftInterfaceType ) ;